package com.heima.wemedia.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");

        //4.判断token是否存在
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        //5.是否过期
        int result = AppJwtUtil.verifyToken(claimsBody);
        if (result == 1 || result == 2) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.解析token，获取token中的id
        String id = claimsBody.get("id").toString();
        if (StringUtils.isBlank(id)) {
            //如果id为null，返回
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //将id添加到请求头中
        //重构请求头
        ServerHttpRequest httpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", id)).build();
        //重构exchange
        ServerWebExchange webExchange = exchange.mutate().request(httpRequest).build();
        return chain.filter(webExchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
